巧用触发器对"SQL Server"进行数据备份

create table test3(id int primary key not null 
identity(1,1),uname varchar(20),uage int); 
create table test3_bak(id int primary key not 
null identity(1,1),bid int,uname varchar(20), 
uage int,active char(1));

alter trigger test3_bak_insert_update 
on test3 
for insert,update 
as 
declare @id int 
declare @uname varchar(20) 
declare @uage int 
begin 
select @id=id,@uname=uname,@uage=uage from inserted 
if @id<>0 
begin 
update test3_bak set active='0' where bid=@id 
insert into test3_bak(bid,uname,uage,active) 
values(@id,@uname,@uage,'1') 
end 
end

insert into test3(uname,uage) values('FLB',20) 
insert into test3(uname,uage) values('FLB1',21) 
insert into test3(uname,uage) values('FLB2',22) 
update test3 set uage=100 where id=27 
delete from test3 where id=20

select * from test3 
select * from test3_bak